<template>
  <view
      class="u-keyboard"
      @touchmove.stop.prevent="noop"
  >
    <view
        v-for="(item, index) in numList"
        :key="index"
        class="u-keyboard__button-wrapper"
    >
      <view
          :hover-stay-time="200"
          :style="[itemStyle(index)]"
          class="u-keyboard__button-wrapper__button"
          hover-class="u-hover-class"
          @tap="keyboardClick(item)"
      >
        <text class="u-keyboard__button-wrapper__button__text">{{ item }}</text>
      </view>
    </view>
    <view
        class="u-keyboard__button-wrapper"
    >
      <view
          :hover-stay-time="200"
          class="u-keyboard__button-wrapper__button u-keyboard__button-wrapper__button--gray"
          hover-class="u-hover-class"
          @touchend="clearTimer"
          @touchstart.stop="backspaceClick"
      >
        <u-icon
            color="#303133"
            name="backspace"
            size="28"
        ></u-icon>
      </view>
    </view>
  </view>
</template>

<script>
import props from './props.js';

/**
 * keyboard 键盘组件
 * @description
 * @tutorial
 * @property {String}  mode    键盘的类型，number-数字键盘，card-身份证键盘
 * @property {Boolean}  dotDisabled  是否显示键盘的"."符号
 * @property {Boolean}  random    是否打乱键盘按键的顺序
 * @event {Function} change    点击键盘触发
 * @event {Function} backspace  点击退格键触发
 * @example
 */
export default {
  mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
  data() {
    return {
      backspace: 'backspace', // 退格键内容
      dot: '.', // 点
      timer: null, // 长按多次删除的事件监听
      cardX: 'X' // 身份证的X符号
    };
  },
  computed: {
    // 键盘需要显示的内容
    numList() {
      let tmp = [];
      if (this.dotDisabled && this.mode == 'number') {
        if (!this.random) {
          return [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
        } else {
          return uni.$u.randomArray([1, 2, 3, 4, 5, 6, 7, 8, 9, 0]);
        }
      } else if (!this.dotDisabled && this.mode == 'number') {
        if (!this.random) {
          return [1, 2, 3, 4, 5, 6, 7, 8, 9, this.dot, 0];
        } else {
          return uni.$u.randomArray([1, 2, 3, 4, 5, 6, 7, 8, 9, this.dot, 0]);
        }
      } else if (this.mode == 'card') {
        if (!this.random) {
          return [1, 2, 3, 4, 5, 6, 7, 8, 9, this.cardX, 0];
        } else {
          return uni.$u.randomArray([1, 2, 3, 4, 5, 6, 7, 8, 9, this.cardX, 0]);
        }
      }
    },
    // 按键的样式，在非乱序&&数字键盘&&不显示点按钮时，index为9时，按键占位两个空间
    itemStyle() {
      return index => {
        let style = {};
        if (this.mode == 'number' && this.dotDisabled && index == 9) style.width = '464rpx';
        return style;
      };
    },
    // 是否让按键显示灰色，只在非乱序&&数字键盘&&且允许点按键的时候
    btnBgGray() {
      return index => {
        if (!this.random && index == 9 && (this.mode != 'number' || (this.mode == 'number' && !this
            .dotDisabled))) return true;
        else return false;
      };
    },
  },
  created() {

  },
  methods: {
    // 点击退格键
    backspaceClick() {
      this.$emit('backspace');
      clearInterval(this.timer); //再次清空定时器，防止重复注册定时器
      this.timer = null;
      this.timer = setInterval(() => {
        this.$emit('backspace');
      }, 250);
    },
    clearTimer() {
      clearInterval(this.timer);
      this.timer = null;
    },
    // 获取键盘显示的内容
    keyboardClick(val) {
      // 允许键盘显示点模式和触发非点按键时，将内容转为数字类型
      if (!this.dotDisabled && val != this.dot && val != this.cardX) val = Number(val);
      this.$emit('change', val);
    }
  }
};
</script>

<style lang="scss" scoped>
@import "../../libs/css/components.scss";

$u-number-keyboard-background-color:rgb(224, 228, 230) !default;
$u-number-keyboard-padding:8px 10rpx 8px 10rpx !default;
$u-number-keyboard-button-width:222rpx !default;
$u-number-keyboard-button-margin:4px 6rpx !default;
$u-number-keyboard-button-border-top-left-radius:4px !default;
$u-number-keyboard-button-border-top-right-radius:4px !default;
$u-number-keyboard-button-border-bottom-left-radius:4px !default;
$u-number-keyboard-button-border-bottom-right-radius:4px !default;
$u-number-keyboard-button-height: 90rpx!default;
$u-number-keyboard-button-background-color:#FFFFFF !default;
$u-number-keyboard-button-box-shadow:0 2px 0px #BBBCBE !default;
$u-number-keyboard-text-font-size:20px !default;
$u-number-keyboard-text-font-weight:500 !default;
$u-number-keyboard-text-color:$u-main-color !default;
$u-number-keyboard-gray-background-color:rgb(200, 202, 210) !default;
$u-number-keyboard-u-hover-class-background-color: #BBBCC6 !default;

.u-keyboard {
  @include flex;
  flex-direction: row;
  justify-content: space-around;
  background-color: $u-number-keyboard-background-color;
  flex-wrap: wrap;
  padding: $u-number-keyboard-padding;

  &__button-wrapper {
    box-shadow: $u-number-keyboard-button-box-shadow;
    margin: $u-number-keyboard-button-margin;
    border-top-left-radius: $u-number-keyboard-button-border-top-left-radius;
    border-top-right-radius: $u-number-keyboard-button-border-top-right-radius;
    border-bottom-left-radius: $u-number-keyboard-button-border-bottom-left-radius;
    border-bottom-right-radius: $u-number-keyboard-button-border-bottom-right-radius;

    &__button {
      width: $u-number-keyboard-button-width;
      height: $u-number-keyboard-button-height;
      background-color: $u-number-keyboard-button-background-color;
      @include flex;
      justify-content: center;
      align-items: center;
      border-top-left-radius: $u-number-keyboard-button-border-top-left-radius;
      border-top-right-radius: $u-number-keyboard-button-border-top-right-radius;
      border-bottom-left-radius: $u-number-keyboard-button-border-bottom-left-radius;
      border-bottom-right-radius: $u-number-keyboard-button-border-bottom-right-radius;

      &__text {
        font-size: $u-number-keyboard-text-font-size;
        font-weight: $u-number-keyboard-text-font-weight;
        color: $u-number-keyboard-text-color;
      }

      &--gray {
        background-color: $u-number-keyboard-gray-background-color;
      }
    }
  }
}

.u-hover-class {
  background-color: $u-number-keyboard-u-hover-class-background-color;
}
</style>
